[单选题]
n airplane in straigo*suo2 n09/hj tg2uszht level flight exp k,*ez.p.rn lih g/iv-eriences a lift force $L$ that is proportional to the speed of the plane and is perpendicular to the axis of the wings and as shown in diagram.
On a banked turn at the same speed, the wings make an angle $θ$ with the horizontal.
Which of the following gives the centripetal force on the airplane?
